JPS6346600A - Transmission system for alarm monitor - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field-1] The present invention relates to a transmission method used in an alarm monitoring device (ζ).

``Prior Art'' Conventionally, as shown in FIG. 2, an alarm monitoring device using a transmission means includes a receiver 1, a transmission line 2 branching from the receiver to each monitoring area, and this transmission line. The sensor connected to the terminal 2 is composed of a plurality of terminal devices 31 to 39 such as repeaters. The receiver 1 includes a transmission device 11 connected to a transmission line 2, a signal processing device 10 consisting of a microcomputer, etc., and a display device 1 for displaying various alarms.
It is composed of 2. The resistance R and the capacitance C are the resistance of the 20 transmission lines and the idle capacitance shown in equal numbers.

A unique address is set for each terminal device 31-39. Then, the receiver 1 sequentially calls each of the terminals 31 to 39, and the called terminals 31 to 39 return sensor detection levels or failure information.

Receiver 1 has been constantly monitoring since the evening of return day 2. Generally, the monitoring range often extends radially from the receiver 1, so the transmission line 2 is often extended 1 minute from the middle as shown in FIG.

"Problems to be Solved by the Invention" As shown in Figure 2, the transmission line 2 of the conventional alarm monitoring device
Since the total length of the line becomes small, the stray capacitance between the lines cannot be ignored, resulting in distortion of the transmission waveform, a limit on the transmission speed, or a limit on the total length of the transmission line. Furthermore, if a short circuit accident occurs at any one point on the transmission line 2, communication with all terminal devices becomes impossible, and there is a drawback that alarm monitoring becomes completely impossible.

"Means to Solve the Problem" The transmission system of the alarm monitoring device of this invention consists of a transmission line consisting of an independent I or a plurality of transmission lines 1~, and a receiver is provided with 1~ each corresponding to the transmission line. It is characterized by having a transmission device g consisting of a plurality of transmission input/output circuits and a common signal conversion circuit that drives the plurality of transmission input/output circuits, and the transmission line is connected to a plurality of independent transmission lines. Since transmission input/output circuits are provided for each of these multiple transmission lines, the total length of the transmission line can be increased, and even if a short circuit occurs on the transmission line, There is no need to worry about the loss of power in the entire system as the end of the terminal equipment connected to the transmission line is lost.

[Example 1] Hereinafter, this invention will be specifically explained based on an example (l'l) showing the present invention in one section.

FIG. 1 is a block diagram showing an embodiment of the transmission system of the alarm monitoring device of the present invention. This alarm monitoring device is for receiver 1
, three mutually independent transmission lines 21-23 extending from the receiver 1 to each monitoring area, and a plurality of terminal devices 3 such as fL/υ sensors or repeaters connected to each transmission line 21=23.
1 = 39.

The receiver 1 includes a transmission device 11 connected to each transmission line 21 to 23, a signal processing device @ 10 consisting of a microcomputer, etc., and a display device 12 for displaying retrieval information of species r.
3, resistor R1, and capacitor! j-C
is a graph showing line resistance and stray capacitance of transmission lines 21-23. , each of the terminals 31 to 39 is equipped with a transmission circuit for transmitting and receiving signals to and from the receiver 1, and each has its own At1nos set. If the terminal devices 31 to 39 are repeaters, the two sensors are connected via a line. Therefore, the terminal devices 31 to 39 always have detection information such as the fire situation (heat, smoke, flame, etc.) and the state of intrusion.

An overview of the operation of the alarm monitoring device configured as described above will be described. The signal processing device 10 of the receiver 1 drives the transmission device W11. The transmission device 11 has each transmission line 21
The same calling signal is output to 23 to 23.

The calling signal consists of an address and a command, and each terminal device 31-39 receives this calling signal and determines whether it matches its own address. If the judgment results match, an operation sound is made based on the command. The normal command is data/event collection, which returns one hour's worth of detected data. The transmission device 11 of the receiver 1 receives the return data from the terminal device 31=-39 [7], and the signal processing device 10 determines from this return data whether an abnormality has occurred. In the event of an abnormality (fire, intrusion, etc.), the display device 12 is driven to display an alarm. In this way, each of the terminals 31 to 39 is sequentially called, and monitoring operations are performed from collection of returned data.

Transmission device 11 of receiver 1 G, j, each transmission line 21 to 2
:(Input/output circuits are installed for each, and each transmission line 21 to 23 is electrically independent. Therefore, the total length of the transmission line is significantly longer than the total length of the conventional transmission line shown in Figure 2. 1. Next, specific embodiments of the receiver transmission device and terminal device transmission circuit according to the present invention will be described with reference to the drawings.

FIG. 3 is a block circuit diagram showing a transmission device for a receiver according to the invention. This transmission device includes a signal conversion circuit 15 that converts the parallel signal from the signal processing device into parallel to serial, converts the serial signal of the received signal 3 into serial to parallel, and outputs it to the signal processing device 7, and the fuse Pl- 3. Resistance I? , 2i-2
3, R131 = R33, R5□41-・43,)t5
]~53, R61H-63, transistor p T21~T
23, the transmission system consisting of the zesistor T1.
It consists of a waveform product circuit that maintains a constant level. A plurality (3:)) of transmission lines are connected to the terminals 01-3 and L1-3. A plurality of terminal devices are connected to each pair of transmission lines.The serial signal from the signal conversion circuit 15 is sent to the resistor R121, and then connected to each transistor T21 to T23 via the resistor R121. Drive.Transistor T21-
・23 repeatedly turns on and off based on the serial signal.
Therefore, a signal (call l to signal) consisting of voltages at the pair of transmission lines 1f, -1, . . ., is output. This signal is formed from address, command, and return timing signals. The return signal from the terminal device is returned as current information and 12 when transistors T21 to T23 are turned on.

Therefore, a return voltage signal appears in any of the resistors R61 to R63, which makes the voltage drop due to the return current a high level.
Via resistor R41~・13! ~l・Input to the base of transistor T1. A return signal for turning on and off the power supply voltage is output to the collector of the transistor T1, and this signal is serial-parallel converted by the signal conversion circuit 15 and output to the signal processing device.

If a short-circuit accident occurs in a transmission line under such conditions, the overcurrent prevention fuse Fl-3 is blown to prevent overcurrent. If there is sufficient power supply, the resistors 51 to 53 act as current limiters, and the short circuit current does not affect other circuits, the beads F1 to F3 are not particularly necessary. When short circuit, short circuit! , corresponding to the 5-pin line [Also, the emitter voltage of -23 to transistor T21 becomes almost zero, but resistor R41 =
Since C3 is inserted between transistor 1 and transistor 1, it has no effect on the reception of return signals from other transmission lines. Even during slow transmission, the call signal is correctly output to the transmission line other than the transmission line. In this way, this transmission device includes an input/output circuit provided corresponding to each transmission line, a signal conversion circuit 15 connected to these input/output circuits, and one signal conversion circuit 15.
It is composed of.

FIG. 4 is a block circuit diagram showing an embodiment of the transmission circuit of the terminal device. This transmission circuit includes a terminal CO, which is connected to a line extending from terminal CI-3 of the receiver's transmission device, and a terminal L, which is similarly connected to a line extending from terminal L1=-3.
Equipped with O and via diode DI for backflow prevention! 7. An output circuit that charges the voltage based on the transmission signal from the receiver and is composed of a power supply source for the terminal device, a capacitor CP at 12, resistors R7 and 8, a transistor T3, a Zener diode Z4, and a diode D2; It also serves as a signal conversion circuit 30 that converts the sensor detection signal into a serial signal and outputs it to the output circuit when the call signal from the receiver matches the reception 1 to set address.

The transmission signal from the receiver is sent to the signal conversion circuit 3 via the terminal LO.
0 input terminal S1. When the signal conversion circuit 30 receives a paging signal, it compares the address of the paging signal with the nine unique addresses set in the terminal device. If they match, take action based on the command signal. If the command is data collection, data based on the sensor detection signal is output to the output terminal So. If the command is control, a control signal is output. The timing of output to the output terminal SO is determined based on the timing signal from the receiver. Then, the output signal from the output terminal SO turns on and off the transistor T3, and a resistor R7 is connected between the power supply of the capacitor CP. , transistor T3, diode D2, line extending from terminal LO, receiving circuit of receiver transmission device, terminal Co
A circuit of lines extending from the line is formed and a return current flows. In this way, the return signal from the terminal is transmitted to the transmission device of the receiver.

``Effects of the Invention'' As explained above, the transmission method of the alarm monitoring device according to the invention of 1-Dayouni consists of a transmission line f: appropriately separated and composed of a plurality of independent transmission lines, and the transmission device of the receiver is By providing multiple input/output circuits corresponding to the transmission line, the total length of the transmission line can be increased, and even if a short circuit occurs, only a partial system failure occurs. Furthermore, the transmission equipment of the receiver does not become much more complicated or expensive just by increasing the number of input/output circuits (1). In this way, the transmission method of the present invention is extremely useful in the disaster prevention industry.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the alarm 4ζ position of the present invention.
7' lock diagram, Figure 2 is a block diagram showing a conventional alarm monitoring device, Figure 3 is a block diagram showing the transmission device of the receiver of the present invention, and Figure 4 is a block diagram showing the transmission device of the receiver of the present invention. Show the circuit
It is a circuit diagram of the second L1 block. DESCRIPTION OF SYMBOLS 1...Receiver, 10...Signal processing device, 11...Transmission device, 12...-Display device, 2.21.22.23.
...Transmission line, :31-639...Guili terminal, 1
5, :3 +)...Signal conversion circuit. 5th Patent Applicant Niratan Stock Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] A plurality of terminal devices equipped with transmission circuits that have detection information such as fire phenomena and intrusion conditions and are set with unique addresses; a receiver that monitors the whole from the information of the plurality of terminal devices; In a transmission method of an alarm monitoring device consisting of a transmission line connecting a terminal device and the above-mentioned receiver, the above-mentioned transmission line is composed of a plurality of independent transmission lines, and even if a short-circuit accident occurs in the above-mentioned transmission line, A common signal conversion circuit that has a plurality of input/output circuits provided corresponding to the plurality of transmission lines without affecting other transmission lines, and is connected to the plurality of input/output circuits and performs reception and transmission. A transmission system for an alarm monitoring device, characterized in that it is equipped with a transmission device consisting of.